Alnilam is catalogued in this registry as a star, held in the frame of Milky Way, from XHIP distances — naked-eye completeness (V ≤ 6.5).
Registry id HIP_26311 ·
source layer xhip ·
provenance PROCESSED — derived deterministically from source catalogues (unit, frame and epoch conversions, cross-source reconciliation) — no value invented
Open Alnilam in the live scene → The scene composes a position for any date and is where a figure becomes a picture. It downloads the whole catalogue first: measured against the built product, an object outside the core resolves after about 16 s over a local network and about 147 s over a 4 Mbit link, having transferred roughly 70 MB. If you cannot wait that long, this page is the answer.
| Quantity | Value | Uncertainty | Source |
|---|---|---|---|
| Temperature | 13210 K | no published uncertainty in this registry | XHIP distances — naked-eye completeness (V ≤ 6.5) |
Each row carries its own uncertainty and its own source. Where a row says no uncertainty is published, that is what the catalogue says — it is not a claim that the value is exact.
| Kind | star |
|---|---|
| Origin | natural |
d=411.2 pc (XHIP cluster-membership fit, MODELLED — no published σ) · V=1.69 · teff DERIVED from B−V (Ballesteros 2012) · RV 27.3±0.8 km/s [XHIP] · designation HIP 26311 [IAU-CSN]
Reproduced as the source wrote it. Author-year citations link to their DOI where one is registered.
These are absences in the catalogues aggregated here, not measurements of zero, and not statements that the quantity is unknown to science:
| Database | XHIP distances — naked-eye completeness (V ≤ 6.5) |
|---|---|
| Authority | VizieR TAP — V/137D/XHIP (Extended Hipparcos Compilation, Anderson & Francis 2012, AstL 38, 331) |
| Address | https://tapvizier.cds.unistra.fr/TAPVizieR/tap/sync |
| How it entered | RAW snapshot via scripts/ingest-xhip-dist.ts |
| Snapshot | 2026-07-20 |
| Coverage | 284 hip_main V ≤ 6.5 stars the parallax-gated layers lack — the junk-original-parallax class (Deneb, Alnilam…) — placed at the XHIP compiled distance (Anderson & Francis 2012): the HIP2 New-Reduction parallax with the catalogue's own statistical correction where a σ is published (carried per star), else a cluster-membership fit labelled MODELLED with NO invented σ (6); a star with no XHIP distance stays honestly absent. teff DERIVED from B−V (Ballesteros 2012, named per record); measured XHIP radial velocities on 258 (q_RV 'D' excluded); deduplicated by exact HIP + the 6′ direction+magnitude identity gate against every star population already ingested (8005 dropped). Positions are REAL positions at the simulated instant, not the sky as seen from Earth: each catalogue position is displaced along the star's own measured velocity by (J2000 − catalogue epoch) PLUS the light-travel time d/c, since a catalogue records where a star APPEARED. A star with no measured motion is not displaced at all. |
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